OK, let's crack this. We're given 200 and our task is to multiply it by 156. Essentially, we'll be adding 200 to itself 156 times.
Step 1: 0 + 200 = 200
Step 2: 200 + 200 = 400
Step 3: 400 + 200 = 600
Step 4: 600 + 200 = 800
Step 5: 800 + 200 = 1000
Step 6: 1000 + 200 = 1200
Step 7: 1200 + 200 = 1400
Step 8: 1400 + 200 = 1600
Step 9: 1600 + 200 = 1800
Step 10: 1800 + 200 = 2000
Step 11: 2000 + 200 = 2200
Step 12: 2200 + 200 = 2400
Step 13: 2400 + 200 = 2600
Step 14: 2600 + 200 = 2800
Step 15: 2800 + 200 = 3000
Step 16: 3000 + 200 = 3200
Step 17: 3200 + 200 = 3400
Step 18: 3400 + 200 = 3600
Step 19: 3600 + 200 = 3800
Step 20: 3800 + 200 = 4000
Step 21: 4000 + 200 = 4200
Step 22: 4200 + 200 = 4400
Step 23: 4400 + 200 = 4600
Step 24: 4600 + 200 = 4800
Step 25: 4800 + 200 = 5000
Step 26: 5000 + 200 = 5200
Step 27: 5200 + 200 = 5400
Step 28: 5400 + 200 = 5600
Step 29: 5600 + 200 = 5800
Step 30: 5800 + 200 = 6000
Step 31: 6000 + 200 = 6200
Step 32: 6200 + 200 = 6400
Step 33: 6400 + 200 = 6600
Step 34: 6600 + 200 = 6800
Step 35: 6800 + 200 = 7000
Step 36: 7000 + 200 = 7200
Step 37: 7200 + 200 = 7400
Step 38: 7400 + 200 = 7600
Step 39: 7600 + 200 = 7800
Step 40: 7800 + 200 = 8000
Step 41: 8000 + 200 = 8200
Step 42: 8200 + 200 = 8400
Step 43: 8400 + 200 = 8600
Step 44: 8600 + 200 = 8800
Step 45: 8800 + 200 = 9000
Step 46: 9000 + 200 = 9200
Step 47: 9200 + 200 = 9400
Step 48: 9400 + 200 = 9600
Step 49: 9600 + 200 = 9800
Step 50: 9800 + 200 = 10000
Step 51: 10000 + 200 = 10200
Step 52: 10200 + 200 = 10400
Step 53: 10400 + 200 = 10600
Step 54: 10600 + 200 = 10800
Step 55: 10800 + 200 = 11000
Step 56: 11000 + 200 = 11200
Step 57: 11200 + 200 = 11400
Step 58: 11400 + 200 = 11600
Step 59: 11600 + 200 = 11800
Step 60: 11800 + 200 = 12000
Step 61: 12000 + 200 = 12200
Step 62: 12200 + 200 = 12400
Step 63: 12400 + 200 = 12600
Step 64: 12600 + 200 = 12800
Step 65: 12800 + 200 = 13000
Step 66: 13000 + 200 = 13200
Step 67: 13200 + 200 = 13400
Step 68: 13400 + 200 = 13600
Step 69: 13600 + 200 = 13800
Step 70: 13800 + 200 = 14000
Step 71: 14000 + 200 = 14200
Step 72: 14200 + 200 = 14400
Step 73: 14400 + 200 = 14600
Step 74: 14600 + 200 = 14800
Step 75: 14800 + 200 = 15000
Step 76: 15000 + 200 = 15200
Step 77: 15200 + 200 = 15400
Step 78: 15400 + 200 = 15600
Step 79: 15600 + 200 = 15800
Step 80: 15800 + 200 = 16000
Step 81: 16000 + 200 = 16200
Step 82: 16200 + 200 = 16400
Step 83: 16400 + 200 = 16600
Step 84: 16600 + 200 = 16800
Step 85: 16800 + 200 = 17000
Step 86: 17000 + 200 = 17200
Step 87: 17200 + 200 = 17400
Step 88: 17400 + 200 = 17600
Step 89: 17600 + 200 = 17800
Step 90: 17800 + 200 = 18000
Step 91: 18000 + 200 = 18200
Step 92: 18200 + 200 = 18400
Step 93: 18400 + 200 = 18600
Step 94: 18600 + 200 = 18800
Step 95: 18800 + 200 = 19000
Step 96: 19000 + 200 = 19200
Step 97: 19200 + 200 = 19400
Step 98: 19400 + 200 = 19600
Step 99: 19600 + 200 = 19800
Step 100: 19800 + 200 = 20000
Step 101: 20000 + 200 = 20200
Step 102: 20200 + 200 = 20400
Step 103: 20400 + 200 = 20600
Step 104: 20600 + 200 = 20800
Step 105: 20800 + 200 = 21000
Step 106: 21000 + 200 = 21200
Step 107: 21200 + 200 = 21400
Step 108: 21400 + 200 = 21600
Step 109: 21600 + 200 = 21800
Step 110: 21800 + 200 = 22000
Step 111: 22000 + 200 = 22200
Step 112: 22200 + 200 = 22400
Step 113: 22400 + 200 = 22600
Step 114: 22600 + 200 = 22800
Step 115: 22800 + 200 = 23000
Step 116: 23000 + 200 = 23200
Step 117: 23200 + 200 = 23400
Step 118: 23400 + 200 = 23600
Step 119: 23600 + 200 = 23800
Step 120: 23800 + 200 = 24000
Step 121: 24000 + 200 = 24200
Step 122: 24200 + 200 = 24400
Step 123: 24400 + 200 = 24600
Step 124: 24600 + 200 = 24800
Step 125: 24800 + 200 = 25000
Step 126: 25000 + 200 = 25200
Step 127: 25200 + 200 = 25400
Step 128: 25400 + 200 = 25600
Step 129: 25600 + 200 = 25800
Step 130: 25800 + 200 = 26000
Step 131: 26000 + 200 = 26200
Step 132: 26200 + 200 = 26400
Step 133: 26400 + 200 = 26600
Step 134: 26600 + 200 = 26800
Step 135: 26800 + 200 = 27000
Step 136: 27000 + 200 = 27200
Step 137: 27200 + 200 = 27400
Step 138: 27400 + 200 = 27600
Step 139: 27600 + 200 = 27800
Step 140: 27800 + 200 = 28000
Step 141: 28000 + 200 = 28200
Step 142: 28200 + 200 = 28400
Step 143: 28400 + 200 = 28600
Step 144: 28600 + 200 = 28800
Step 145: 28800 + 200 = 29000
Step 146: 29000 + 200 = 29200
Step 147: 29200 + 200 = 29400
Step 148: 29400 + 200 = 29600
Step 149: 29600 + 200 = 29800
Step 150: 29800 + 200 = 30000
Step 151: 30000 + 200 = 30200
Step 152: 30200 + 200 = 30400
Step 153: 30400 + 200 = 30600
Step 154: 30600 + 200 = 30800
Step 155: 30800 + 200 = 31000
Step 156: 31000 + 200 = 31200

So, 200*156 = 31200